Enhanced dimethyl phthalate biodegradation by accelerating phthalic acid di-oxygenation

Area of Science:

• Environmental microbiology
• Bioremediation

Background:

• Dimethyl phthalate (DMP) biodegradation involves hydrolysis to phthalic acid (PA), which can inhibit the process if it accumulates.
• Exogenous electron donors can potentially enhance DMP biodegradation by mitigating PA accumulation.

Purpose of the Study:

• To evaluate the effect of different exogenous electron donors (succinate, acetate, formate) on DMP biodegradation.
• To determine if electron donor addition can accelerate PA removal and improve overall DMP degradation rates.

Main Methods:

• Aerobic biodegradation experiments were conducted with varying initial concentrations of DMP and PA.
• Succinate, acetate, or formate were added as exogenous electron donors at specific concentrations.
• PA removal rates and DMP biodegradation rates were monitored and compared to control experiments.

Main Results:

• PA removal rates increased by 15% and 30% with succinate addition at 0.3 mM and 0.6 mM PA, respectively.
• Equivalent additions of acetate and formate demonstrated similar acceleration effects on PA removal.
• Simultaneous addition of 0.3 mM succinate accelerated the DMP removal rate by 37%, even with coexisting PA.

Conclusions:

• Addition of exogenous electron donors effectively reduces phthalic acid accumulation during DMP biodegradation.
• Electron donor supplementation significantly enhances the rate of dimethyl phthalate biodegradation, offering a promising bioremediation strategy.